Aniket Kate Department of Computer Science Purdue University https://www.cs.purdue.edu/homes/akate/ [email protected]

305 N. University Street West Lafayette, IN USA 47907 Office: +1-765-496-2763

E DUCATION University of Waterloo Ph.D. in Computer Science Advisor: Ian Goldberg

Waterloo, Canada Sep 2006–Jun 2010

Indian Institute of Technology (IIT)—Bombay M.Tech. in Computer Science and Engineering

Mumbai, India Aug 2004–Jun 2006

Mumbai University B.E. in Information Technology

Mumbai, India Aug 1999–Jul 2003

R ESEARCH I NTEREST I design, implement, and analyze privacy, accountability and transparency enhancing technologies. My research integrates cryptography, distributed systems, and hardware-assisted security.

R ESEARCH E XPERIENCE Computer Science, Purdue University Assistant Professor

West Lafayette, IN, USA Aug 2015–present

Cluster of Excellence, Saarland University Junior Faculty Member

Saarbruecken, Germany Aug 2012–Sep 2015

Max Planck Institute for Software Systems (MPI-SWS) Postdoctoral Researcher with Michael Backes

Saarbruecken, Germany Sep 2010–July 2012

University of Waterloo Research Assistant with Ian Goldberg Research Assistant with Urs Hengartner

Waterloo, Canada May 2007–Aug 2010 Sep 2006–Apr 2007

S ELECTED O NGOING P ROJECTS  Cryptocurrencies and Payment Networks Analyze and improve the privacy and security properties of cryptocurrencies (e.g., Bitcoin) and IOU credit networks (e.g., Ripple); Develop innovative (payment/smart) contracts for interesting real-world applications. Work published at ESORICS’14, NDSS’15, CCS’15, PETS’16, and NDSS’17.

 Analyzing and Improving Anonymous Communication Networks Develop a framework (AnoA) for defining, analyzing, and quantifying anonymity properties for ACNs, and assess the real-time anonymity of the Tor network Work published at CSF’12 ’13, CCS’14, and in JPC

 Cryptography for Anonymity Develop cryptographic primitives to enhance privacy, scalability, efficiency, and accountability of anonymous communication and anonymous storage protocols Work published at PETS’07, FC’10, WPES’12, ACNS’14 ’15, ESORICS’16, NDSS’17 and in TISSec.

 Transparency Enhancing Technologies Design secure data transfer architecture (Lime) facilitating transparency in malicious data lineage scenarios; Develop tampering detection approach allowing social network operators to detect computations manipulated by Sybil attacks. Work published at COSN’15 and in TDSC

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 Longitudinal Privacy and Right to Delete/Conceal Analyze users’ deletion habits on the online platform and the associated Streisand effect; Propose effective countermeasures to protect those deletions from the Cyberstalkers. Work published at SOUPS’16 and in Internet Computing

 Using Trusted Hardware for Privacy-preserving Distributed Systems Demonstrate the utility of trusted hardware towards solving the problem of privacy-preserving online advertising, and towards improving the resiliency of distributed protocol in the form of non-equivocation Work published as Oakland’12, PODC’12 ’14, and NDSS’15

R EFEREED P UBLICATIONS My advisee are underlined for clarity.

J OURNAL /M AGAZINE A RTICLES AND B OOK C HAPTERS 1 “Longitudinal Privacy Management in Social Media: The Need for Better Controls” Mainack Mondal, Johnnatan Messias, Saptarshi Ghosh, Krishna P. Gummadi, and Aniket Kate To appear in IEEE Internet Computing (IC), 2017 2 “AnoA: A Framework for Analyzing Anonymous Communication Protocols” Michael Backes, Aniket Kate, Praveen Manoharan, Sebastian Meiser, and Esfandiar Mohammadi To appear in Journal of Privacy and Confidentiality (JPC), 2016 3 “Data Lineage in Malicious Environments” Michael Backes, Niklas Grimm, and Aniket Kate IEEE Transactions on Dependable and Secure Computing (TDSC), 13(2): 178-191, 2016 4 “Achieving Optimal Utility for Distributed Differential Privacy Using Secure Multiparty Computation” Fabienne Eigner, Aniket Kate, Matteo Maffei, Francesca Pampaloni, and Ivan Pryvalov Book chapter, Applications of Secure Multiparty Computation, IOS CISS, 13(5), 2015 5 “Towards Practical Communication in Byzantine-Resistant DHTs” Maxwell Young, Aniket Kate, Ian Goldberg, and Martin Karsten IEEE/ACM Transactions on Networking (ToN), 21(1), Feb 2013 6 “Generalizing Cryptosystems Based on the Subset Sum Problem” Aniket Kate and Ian Goldberg Springer International Journal of Information Security (IJIS), 10 (3), May 2011 7 “Pairing-Based Onion Routing with Improved Forward Secrecy” Aniket Kate, Gregory M. Zaverucha, and Ian Goldberg ACM Transactions on Information and System Security (TISSEC), 13(4), Dec 2010 C ONFERENCE P UBLICATIONS 8 “P2P Mixing and Unlinkable Bitcoin Transactions” Tim Ruffing, Pedro Moreno-Sanchez, and Aniket Kate To appear at Network and Distributed System Security Symposium (NDSS), Feb 2017 9 “SilentWhispers: Enforcing Security and Privacy in Decentralized Credit Networks” Giulio Malavolta, Pedro Moreno-Sanchez, Aniket Kate, and Matteo Maffei To appear at Network and Distributed System Security Symposium (NDSS), Feb 2017 10 “Anonymous RAM” Michael Backes, Amir Herzberg, Aniket Kate, and Ivan Pryvalov 21st European Symposium on Research in Computer Security (ESORICS), Sep 2016 11 “Listening to Whispers of Ripple: Linking Wallets and Deanonymizing Transactions in the Ripple Network” Pedro Moreno-Sanchez, Muhammad Bilal Zafar, and Aniket Kate Privacy Enhancing Technologies Symposium (PETS), Jun 2016 12 “Forgetting in Social Media: Understanding and Controlling Longitudinal Exposure of Socially Shared Data” Mainack Mondal, Johnnatan Messias, Saptarshi Ghosh, Krishna P. Gummadi, and Aniket Kate USENIX Symposium on Usable Privacy and Security (SOUPS), Jun 2016

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13 “Strength in Numbers: Robust Tamper Detection in Crowd Computations” Bimal Viswanath, Muhammad Ahmad Bashir, Muhammad Bilal Zafar, Simon Bouget, Saikat Guha, Krishna P. Gummadi, Aniket Kate, and Alan Mislove ACM Conference on Online Social Networks (COSN), Nov 2015 14 “Liar, Liar, Coins on Fire!: Penalizing Equivocation By Loss of Bitcoins” Tim Ruffing, Aniket Kate, and Dominique Schroeder 22nd ACM Conference on Computer and Communications Security (CCS), Oct 2015 15 “Post-Quantum Forward Secure Onion Routing (Future Anonymity in Today’s Budget)” Satrajit Ghosh and Aniket Kate 13th International Conference on Applied Cryptography and Network Security (ACNS), June 2015 16 “Secrecy without Perfect Randomness: Cryptography with (Bounded) Weak Sources” Michael Backes, Aniket Kate, Sebastian Meiser, and Tim Ruffing 13th International Conference on Applied Cryptography and Network Security (ACNS), June 2015 17 “Visigoth Fault Tolerance” Daniel Porto, Joao Leitao, Cheng Li, Allen Clement, Aniket Kate, Flavio Junqueira, and Rodrigo Rodrigues European Conference on Computer Systems (EuroSys), April 2015 18 “Privacy Preserving Payments in Credit Networks” Pedro Moreno-Sanchez, Aniket Kate, Matteo Maffei, and Kim Pecina Network and Distributed System Security Symposium (NDSS), Feb 2015 19 “Privacy-preserving Data Aggregation with Optimal Utility” Fabienne Eigner, Aniket Kate, Matteo Maffei, Francesca Pampaloni, and Ivan Pryvalov 30th Annual Computer Security Applications Conference (ACSAC), Dec 2014 20 “(Nothing else) MATor(s): Monitoring the Anonymity of Tor’s Path Selection” Michael Backes, Aniket Kate, Sebastian Meiser, and Esfandiar Mohammadi 21st ACM Conference on Computer and Communications Security (CCS), Nov 2014 21 “CoinShuffle: Practical Decrentralized Coin Mixing for Bitcoin” Tim Ruffing, Pedro Moreno-Sanchez, and Aniket Kate 19th European Symposium on Research in Computer Security (ESORICS), Sep 2014 22 “Asynchronous MPC with a Strict Honest Majority Using Non-equivocation” Michael Backes, Fabian Bendun, Ashish Choudhury, and Aniket Kate 33rd ACM Symposium on Principles of Distributed Computing (PODC), July 2014 23 “Introducing Accountability to Anonymity Networks” Michael Backes, Jeremy Clark, Peter Druschel, Aniket Kate, and Milivoj Simeonovski 12th International Conference on Applied Cryptography and Network Security (ACNS), June 2014 24 “AnoA: A Framework For Analyzing Anonymous Communication Protocols” Michael Backes, Aniket Kate, Praveen Manoharan, Sebastian Meiser, and Esfandiar Mohammadi 26th IEEE Computer Security Foundations Symposium (CSF), June 2013 25 “Asynchronous Computational VSS with Reduced Communication Complexity” Michael Backes, Amit Datta, and Aniket Kate Cryptographers’ Track - RSA Conference (CT-RSA), Feb 2013 26 “On the (Limited) Power of Non-Equivocation” Allen Clement, Flavio Junqueira, Aniket Kate, and Rodrigo Rodrigues 31st ACM Symposium on Principles of Distributed Computing (PODC), Jul 2012 27 “Provably Secure and Practical Onion Routing” Michael Backes, Ian Goldberg, Aniket Kate, and Esfandiar Mohammadi 25th IEEE Computer Security Foundations Symposium (CSF), Jun 2012 28 “ObliviAd: Provably Secure and Practical Online Behavioral Advertising” Michael Backes, Aniket Kate, Matteo Maffei, and Kim Pecina 33rd IEEE Symposium on Security and Privacy (Oakland), May 2012

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29 “Adding Query Privacy to Robust DHTs” Michael Backes, Ian Goldberg, Aniket Kate, and Tomas Toft 7th ACM Symposium on Information, Computer and Communications Security (ASIACCS), May 2012 30 “Computational Verifiable Secret Sharing Revisited” Michael Backes, Aniket Kate, and Arpita Patra 17th International Conference on the Theory and Application of Cryptology (ASIACRYPT), Dec 2011 31 “Constant-Size Commitments to Polynomials and Their Applications” Aniket Kate, Gregory M. Zaverucha, and Ian Goldberg 16th International Conference on the Theory and Application of Cryptology (ASIACRYPT), Dec 2010 32 “Distributed Private-Key Generators for Identity-Based Cryptography” Aniket Kate and Ian Goldberg 7th Conference on Security and Cryptography for Networks (SCN), Sep 2010 33 “Practical Robust Communication in DHTs Tolerating a Byzantine Adversary” Maxwell Young, Aniket Kate, Ian Goldberg, and Martin Karsten 30th International Conference on Distributed Computing Systems (ICDCS), Jun 2010 34 “Using Sphinx to Improve Onion Routing Circuit Construction” Aniket Kate and Ian Goldberg 14th International Conference on Financial Cryptography and Data Security (FC), Jan 2010 35 “Distributed Key Generation for the Internet” Aniket Kate and Ian Goldberg 29th International Conference on Distributed Computing Systems (ICDCS), Jun 2009 36 “Anonymity and Security in Delay Tolerant Networks” Aniket Kate, Gregory M. Zaverucha, and Urs Hengartner 3rd International Conf. on Security and Privacy in Communication Networks (SecureComm), Sep 2007 37 “Pairing-Based Onion Routing” Aniket Kate, Gregory M. Zaverucha, and Ian Goldberg 7th Privacy Enhancing Technologies Symposium (PET), Jun 2007

W ORKSHOP P UBLICATIONS AND T HESES 38 “Lime: Data Lineage in the Malicious Environment” Michael Backes, Niklas Grimm, and Aniket Kate 10th International Workshop on Security and Trust Management (STM), Sep 2014 39 “Identity-Based Steganography and Its Applications to Censorship Resistance” Tim Ruffing, Jonas Schneider, Aniket Kate 6th Workshop on Hot Topics in Privacy Enhancing Technologies (HotPETs), Jul 2013 40 “Ace: An Efficient Key-Exchange Protocol for Onion Routing” Michael Backes, Aniket Kate, and Esfandiar Mohammadi 11th ACM Workshop on Privacy in the Electronic Society (WPES), Oct 2012 41 Aniket Pundlik Kate: “Distributed Key Generation and Its Applications” PhD Thesis, University of Waterloo, Jun 2010 42 Aniket Kate: “Frobenius Endomorphism Based Cryptosystems” Master Thesis, Indian Institute of Technology (IIT)—Bombay, Jun 2006

P REPRINTS AND S UBMISSIONS 43 “cMix: Anonymization by High-Performance Scalable Mixing” David Chaum, Farid Javani, Aniket Kate, Anna Krasnova, Joeri de Ruiter, and Alan T. Sherman Under submission, Available as IACR Cryptology ePrint Archive Report: 2016-008, Jan 2016 This work recently appeared in WIRED and in Fortune magazines. 44 “Encrypting Messages for Incomplete Webs of Trust” Sanjit Chatterjee, Deepak Garg, Aniket Kate, and Tobias Theobald Under submission, Jan 2016

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45 “ClearChart: Ensuring Integrity of Consumer Ratings in Online Marketplaces” Uzair Mahmood, Pedro Moreno-Sanchez and Aniket Kate Under submission, Jan 2016

S ELECTED I NVITED TALKS  “Keynote: Distributed IOweYou Credit Networks” at International Conference on Distributed Computing and Networking (ICDCN), Hyderabad, India. Jan 2017.  “Tutorial: An Introduction to Credit Networks” at ACM Conference on Computer and Communications Security (CCS), Vienna, Austria. Oct 2016.  “Distributed IOweYou Credit Networks” at Workshop on Distributed Cryptocurrencies and Consensus Ledgers (DCCL 2016), co-located with PODC 2016. July 2016  “Enabling trust with privacy in virtual marketplaces using credit networks” at Computer Science (CS) Colloquium Series, Indiana University, Bloomington. Apr 2016  “(Working group) Genome Privacy: Architecture and middleware” at Dagstuhl Seminar 15431, Dagstuhl, Germany. Oct 2015  “Future Anonymity in Today’s Budget” at NIST Workshop on Cybersecurity in a Post-Quantum World (NIST PQC), Gaithersburg, USA. Apr 2015  “A little trusted hardware can go a long way towards privacy” at CASED, TU Darmstadt, Germany. Mar 2015  “Anonymous Communication Networks: Design, Analysis and Challenges” at TU Dresden, Germany. Sep 2014  “Differential Guarantees for Cryptographic Systems” at Microsoft Research, India. Apr 2014  “Asynchronous MPC with a Strict Honest Majority Using Non-equivocation” at Applied Multi-Party Computation Workshop, Microsoft Research, Redmond, USA. Feb 2014  “Introducing Accountability to Onion Routing” at Grande Region Security and Reliability Day (GRSRD 2013). Apr 2013  “Towards Practical and Efficient Distributed Trust” at Indian Institute of Technology-Kharagpur (IIT-Kgp), India. Sep 2012  “An Interplay between Anonymity, Privacy, and Accountability” at Indian Statistical Institute (ISI), Kolkata, India. Sep 2012  “Recent Improvements to Onion Routing” at IBM Research - Zurich, Rueschlikon, Switzerland. Jan 2012  “Recent Improvements in Onion Routing Circuit Construction” in the Laboratory of Algorithmics, Cryptology and Security (LACS), University of Luxembourg, Luxembourg. Feb 2010  “Anonymous Key Agreement in an Identity-based Infrastructure and Applications” at the MITACS 2009 Annual Conference, Canada. Jun 2009

S UPERVISION E XPERIENCE PhD Candidates 1 Tim Ruffing (@Saarland University, Germany) Topic: Cryptocurrencies: Science and Applications 2 Pedro Moreno-Sanchez Topic: IOweYou Credit Network Systems 3 Sze Yiu Chau (with Ninghui Li) Topic: Formal Analysis of Real-World Security Protocols 4 Mohsen Minaei Topic: Right to be Forgotten

Summer 2013–Spring 2017

Winter 2013/14–Fall 2017

Fall 2015–Spring 2018

Fall 2015–Fall 2018

Aniket Kate

5 Debajyoti Das Teaching Assistant, Qual I in progress

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Fall 2015–Spring 2020

Graduate Advisees 5 Duc V Le (with Mikhail Atallah) Teaching Assistant, Qual I in progress

Fall 2015–Spring 2020

6 Easwar V Mangipudi Teaching Assistant, Qual I in progress

Fall 2015–Spring 2020

Master Thesis Students 1 2 3 4 5

Siddharth Gupta Simon Heinzel (@Saarland University) Tobias Theobald (@Saarland University) Uzair Mahmood (@Saarland University) Ivan Pryvalov (@Saarland University)

Spring 2016–present Summer 2015–Winter 2015/16 Summer 2015–Winter 2015/16 Winter 2014/15–Summer 2015 Summer 2013–Summer 2014

Bachelor Thesis Student 1 Niklas Grimm (@Saarland University)

Winter 2012/13

T EACHING E XPERIENCE Purdue University (CS 528) Network Security (CS 426) Computer Security (CS 699) Hot Topics in Privacy Enhancing Technologies Saarland University Advanced Course: Applied Cryptography Seminar: Practical Cryptographic Systems Advanced Course: Privacy Enhancing Technologies (co-taught)

Spring 2016, 2017 Fall 2016 Fall 2015 Winter 2014/15 Winter 2012/13, Summer 2014 Summer 2013, 2014, 2015

P ROFESSIONAL ACTIVITIES  Program Committee Member: @Purdue University CSF 2017, POST 2017, Eurocrypt 2016. ICDCS 2016-17. UEOP 2016. FC 2016. Bitcoin 2016-17. ACNS 2016. ACM CCSW 2015. ACM WPES 2015. @Saarland University IEEE CloudCom 2015. FCS 2015. ICDCS 2015. ICWE 2015. CPSS 2015. HotPETS 2014. ProvSec 2014-15. WWW 2013. SPACE 2013-14. ACM WPES 2012.  Conference Leadership: Poster/Demo co-Chair

ACM CCS 2016

 External Reviewer (Journals): ACM TISSec. Computer Security. ACM TWEB. IEEE Information Theory. Designs, Codes and Cryptography (DCC). IEEE TIFS. IEEE TDSC. Distributed Computing (DC). IEEE TPDS. IEEE Transactions on Computers (ToC). Information Processing Letters (IPL). Acta Informatica.  Bitcoin Foundation Grant Committee  Centre for Applied Cryptographic Research (CACR) Cryptography Seminar Organizer  SecNet 2006, Annual Network Security Workshop Overall Coordinator

2014 University of Waterloo Spring 2008 IIT-Bombay Spring 2006

U NIVERSITY ACTIVITIES  Member, Graduate Admissions Committee, CS, Purdue University

Fall 2015–present

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 Member, INSC Admission Committee, CERIAS, Purdue University

Spring 2016–present

 College of Science Team Award, Purdue University Development work toward the professional masters degree concentration in information security  Started the Crypto Reading Group, Purdue University

Fall 2015

weekly, Spring 2016–present

 Started the Internet of Value Research meetings, Purdue University

weekly, Fall 2016–present

 Undergraduate Research Engagement Seminar Talk, CS 397 Honors Seminar, Purdue University Seminar Talk, CS 397 Honors Seminar, Purdue University

Fall 2015 Fall 2016

AWARDS AND H ONORS  Best paper award at ACM Conference on Online Social Networks (COSN 2015)

Nov 2015

 Nominated for a Distinguished Dissertation Award of the Canadian Association for Graduate Studies

Winter 2011

 University of Waterloo Graduate Scholarship

Winter 2008

 David R. Cheriton Graduate Scholarship, University of Waterloo

2007–10

 Technical Color for excellence in technical activities by Computer Science and Engineering Association (CSEA), IIT-Bombay 2005–06  Competence in Software Technology (CST) award by the Centre for Development of Advanced Computing (C-DAC), India 2004

OTHER S ERVICES AND W ORK  Research Group Leaders’ Representative at the MMCI Clusterboard, Saarland University  Director Search Committee, School of Computer Science Graduate Students Representative  Division Manager (Don) at Waterloo Co-op Residence Inc.(WCRI), Canada

2013-15

University of Waterloo 2009-10 Fall 2008

 Industrial Experience · Member of Technical Staff, Persistent Systems Pvt. Ltd. (PSPL), India · Trainee System Analyst, National Stock Exchange (NSE.iT), India

Mar 2004–Jul 2004 Aug 2003–Mar 2004

Aniket Kate CS, Purdue University December 2016